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RedHat 9 (Linux i386) - man page for getsockname (redhat section 2)

GETSOCKNAME(2)						     Linux Programmer's Manual						    GETSOCKNAME(2)

NAME
getsockname - get socket name
SYNOPSIS
#include <sys/socket.h> int getsockname(int s, struct sockaddr *name, socklen_t *namelen);
DESCRIPTION
Getsockname returns the current name for the specified socket. The namelen parameter should be initialized to indicate the amount of space pointed to by name. On return it contains the actual size of the name returned (in bytes).
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
EBADF The argument s is not a valid descriptor. ENOTSOCK The argument s is a file, not a socket. ENOBUFS Insufficient resources were available in the system to perform the operation. EFAULT The name parameter points to memory not in a valid part of the process address space.
CONFORMING TO
SVr4, 4.4BSD (the getsockname function call appeared in 4.2BSD). SVr4 documents additional ENOMEM and ENOSR error codes.
NOTE
The third argument of getsockname is in reality an `int *' (and this is what BSD 4.* and libc4 and libc5 have). Some POSIX confusion resulted in the present socklen_t. The draft standard has not been adopted yet, but glibc2 already follows it and also has socklen_t. See also accept(2).
SEE ALSO
bind(2), socket(2) BSD Man Page 1993-07-24 GETSOCKNAME(2)